MOON IO

• It is a little bit bigger than our own
• Galileo originally called Jupiter's moons the Medicean planets,are referred to the individual moons numerically as I, II, III, and IV.
• Jupiter has over 68 moons that orbit it.
• Volcanic plumes rise 300 km (190 miles) above the surface, with material spewing out at nearly half the required escape velocity.
• Although Io always points the same side toward Jupiter in its orbit around the giant planet, the large moons Europa and Ganymede perturb Io's orbit into an irregularly elliptical one. Thus, in its widely varying distances from Jupiter, Io is subjected to tremendous tidal forces. These forces cause Io's surface to bulge up and down (or in and out) by as much as 100 m (330 feet)! Compare these tides on Io's solid surface to the tides on Earth's oceans. On Earth, in the place where tides are highest, the difference between low and high tides is only 18 m (60 feet)

PICTURES OF IO

NOTES

• Galileo originally called Jupiter's moons the Medicean planets,
• He named individual moons numerically as I, II, III, and IV.
• Galileo's naming system would be used for a couple of centuries.
• There are 67 moons that orbit jupiter.

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THE SIZE COMPARED

LAST 2 PHOTOS ARE FROM PICTURES OF THE MOON IO